Remove <iostream> where possible.

ipc/sync_socket_unittest.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdio.h>
-#include <iostream>
 #include <string>
 #include <sstream>
 
 #include "base/message_loop.h"
 #if defined(OS_LINUX) || defined(OS_MACOSX)
 #include "base/file_descriptor_posix.h"
 #endif  // defined(OS_LINUX) || defined(OS_MACOSX)
 #include "base/platform_thread.h"
 #include "base/process_util.h"
 #include "base/sync_socket.h"
@@ skipping 225 matching lines @@
 #endif  // defined(OS_WIN)
   EXPECT_TRUE(chan.Send(msg));
   // Use the current thread as the I/O thread.
   MessageLoop::current()->Run();
   // Shut down.
   delete pair[0];
   delete pair[1];
   EXPECT_TRUE(base::WaitForSingleProcess(server_process, 5000));
   base::CloseProcessHandle(server_process);
 }